Posted by **joshua** on Sunday, December 30, 2012 at 4:47pm.

1. If $ is defined for all positive numbers x and y by x$y = 3x + 8y - y^3, then 10$2 =

A. 38

B. 102

C. 14

D. 20

2. If & is defined for all positive numbers w and z by w & z = 15wz - 10w + 2 then 3 & 4 =

A. 67

B. 77

C. 142

D. 152

3. All of the following are in the domain of f(x) = 5/ x + 2 except:

A. 5

B. -5

C. 2

D. -2

could you explain to me how to get the answer for them

- mathematics -
**Reiny**, Sunday, December 30, 2012 at 5:02pm
1 and 2

the operations are defined, so just sub in as defined.

1.

10$2 = 3(10) + 8(2) - 2^3 = ....

same for #2

3. f(x) = 5/x + 2

the function is defined for all real values of x, except x = 0

This is not one of your choices, so the question is bogus.

If you meant f(x) = 5/(x+2) , then the function is defined for all real values of x, except x = -2

## Answer This Question

## Related Questions

- PHYSICS - Consider a series of integers that are all positive and all of the ...
- PHYSICS - Consider a series of integers a1< a2<... < a43 < a44 that...
- math - let A be defined as the set of all two digit integers that are more than ...
- math - what is the factorial of a negative number? The factorial function has ...
- Discrete Mathematics. Need Help - Let A be the set of all ordered pairs of ...
- Algebra 2 .. - Please explain on how to do each of these! *Let (x) be defined ...
- Math - In a class of 550 students, students may take all, none, or a combination...
- Algebra 2..... - *Please explain on how to do each of these! 1. Let (x) be ...
- ALGEBRA 2... - *Please explain on how to do each of these! 1. Let (x) be defined...
- Calculus - If the functions f and g are defined for all real numbers and f is an...

More Related Questions